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Mk 4 6.5-20 Vs 8.5-25?

 
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  #1  
Old 07-11-2012, 08:17 AM
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Mk 4 6.5-20 Vs 8.5-25?

I am tossing up between the 6.5-20x and 8.5-25x but before the long string of people chime in saying that 6.5-20 is plenty, I prefer higher magnification. It makes me feel more precise.

What I want to find out about the eventual differences in the scopes has more to do with their clarity in marginal conditions.

For example on one rifle I have a NF 8-32x and I find that as with ll scopes, on the highest setting you get diminishing returns. However, on a 32x scope, when you set it at 20x, or 25x, you tend to get better clarity, less distortion and a greater FOV than you would with a scope that maxes out at the same 20x.

In fact I don't often use the 8-32 on 32x, but tend to use it around the 25 mark quite often, just by looking through it and turning up the magnification until it starts suffer, then back down.

Can I assume with these two Leupolds that the FOV should be pretty much identical at 20x and 8.5x?

Will the 8.5-25 give me better resolution at 20 than the 6.5-20, or is this just an impression I have?

One more consideration is that with a front focal plane reticle; the higher magnification will impose a reticle that appears to be and in the case of the TMR I have chosen, that will allow you to see more through the gap in the middle of the junction of the crosshairs, so I wonder if that will be distracting or take away from the more precise feel I get from a fine second plane reticle at high magnification?
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  #2  
Old 07-11-2012, 09:10 AM
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Re: Mk 4 6.5-20 Vs 8.5-25?

Thats a tough question so I will answer based on My experiences with both scopes.

If I were going to shoot F-Class I would chose the 8.5x25 (I assume that they are both have
50mm objective lens). the head position is more critical on the higher powder but this can be
dealt with when position shooting. I find little if any difference in the light gathering ability
of ether scope on max power (There probably is because of the additional power of the 8.5x25)
but I never have both scopes together at the same time.

The 8.5x25 should improve the group size because of the extra power but at long range it
may be a detriment because of mirage, position and heart beat will all be magnified.

The 6.5x20 is better for hunting where the distance and position is unknown because it will go
down to 6.5 and if a running shot presents it's self it is easier to acquire the target with it.

I actually prefer hunting with a 3.5x14x52 for it's all round usability.

On the front focal plain issue I am still undecided on what is best for my use. so I will pass
an opinion on it for a while.

Just my opinion.

J E CUSTOM
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Old 07-11-2012, 10:35 AM
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Re: Mk 4 6.5-20 Vs 8.5-25?

I have owned & used both the 8.5-25x50 SFP TMR & 6.5-20x50 FFP TMR. I haven't had any issues with the "gap" in the FFP TMR being a problem however, it's farily new to me. I haven't noticed a huge difference in clarity or resolution between the two (both MK 4's) but there is a difference in tube diameter, the SFP MK4 was a 30mm, my FFP MK4 is a 34mm tube. The 6.5-20 is going to offer more elevation adjustment when the tube diameter is the same.


The first picture is of my 34mm FFP TMR @ 1060yds on a 16" (ish) target. PS-taking pics through the scope can be dern tough!

The second picture is a reticle pic of a FFP TMR.
Attached Thumbnails - Click to View Larger
Mk 4 6.5-20 Vs 8.5-25?-tmr-1060yds.jpg   Mk 4 6.5-20 Vs 8.5-25?-tmr-reticle.jpg  

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Old 07-11-2012, 10:58 AM
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Re: Mk 4 6.5-20 Vs 8.5-25?

What power setting is the picture taken on?
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Old 07-11-2012, 11:02 AM
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Re: Mk 4 6.5-20 Vs 8.5-25?

Quote:
Originally Posted by yotehunter243 View Post
What power setting is the picture taken on?

Good question... I really don't remember! Should have been 20x, but does not look like it... I know. Probably just a result of my poor photography skills.
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Old 07-11-2012, 11:07 AM
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Re: Mk 4 6.5-20 Vs 8.5-25?

I have a 6.5x20 Mark 4 on a 338 Lapua and at 20X on a STOP sign at 991 yards the gap in the middle is the size of the inside of the P.
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Old 07-11-2012, 07:48 PM
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Re: Mk 4 6.5-20 Vs 8.5-25?

Wow. I haven't posted on here for a while and some time ago I tried an Italian LR forum that I abandoned very quickly after seeing the kind of people, attitudes and competence on there.
We really are lucky to have this community of shooters here.

Here I have got real world, relevant and contextualized info in the space of a few hours on a fairly specific question. Thanks very much for the input!

Keep it coming...
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